Masthead.Published in:Fortschritte der Physik / Progress of Physics, 1963, v. 11, n. 9, p. fmi, doi. 10.1002/prop.19630110901Publication type:Article
Die Methode der Feynmanschen Graphen.Published in:Fortschritte der Physik / Progress of Physics, 1963, v. 11, n. 9, p. 357, doi. 10.1002/prop.19630110902By:Penzlin, F.Publication type:Article